[PATCH 05/10] tcp: Take tcp_hash_insert() address from struct tcp_conn

[David Gibson <david@gibson.dropbear.id.au>]

tcp_hash_insert() takes an address to control which hash bucket the
connection will go into.  For IPv6 connections that address is alreadys
stored in struct tcp_conn.  For IPv4 connections, an equivalent IPv4-mapped
IPv6 address is stored in struct tcp_conn.

Now that we've made the hashing of IPv4 and IPv4-mapped IPv6 addresses
equivalent, we can simplify tcp_hash_insert() to use the address in
struct tcp_conn, rather than taking it as an extra parameter.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
 tcp.c | 15 +++++----------
 1 file changed, 5 insertions(+), 10 deletions(-)

diff --git a/tcp.c b/tcp.c
index 4645004..dfa73a3 100644
--- a/tcp.c
+++ b/tcp.c
@@ -1343,15 +1343,12 @@ static unsigned int tcp_hash(const struct ctx *c, int af, const void *addr,
  * tcp_hash_insert() - Insert connection into hash table, chain link
  * @c:		Execution context
  * @conn:	Connection pointer
- * @af:		Address family, AF_INET or AF_INET6
- * @addr:	Remote address, pointer to in_addr or in6_addr
  */
-static void tcp_hash_insert(const struct ctx *c, struct tcp_conn *conn,
-			    int af, const void *addr)
+static void tcp_hash_insert(const struct ctx *c, struct tcp_conn *conn)
 {
 	int b;
 
-	b = tcp_hash(c, af, addr, conn->tap_port, conn->sock_port);
+	b = tcp_hash(c, AF_INET6, &conn->a.a6, conn->tap_port, conn->sock_port);
 	conn->next_index = tc_hash[b] ? tc_hash[b] - tc : -1;
 	tc_hash[b] = conn;
 	conn->hash_bucket = b;
@@ -2233,7 +2230,7 @@ static void tcp_conn_from_tap(struct ctx *c, int af, const void *addr,
 	conn->seq_to_tap = tcp_seq_init(c, af, addr, th->dest, th->source, now);
 	conn->seq_ack_from_tap = conn->seq_to_tap + 1;
 
-	tcp_hash_insert(c, conn, af, addr);
+	tcp_hash_insert(c, conn);
 
 	if (!bind(s, sa, sl)) {
 		tcp_rst(c, conn);	/* Nobody is listening then */
@@ -2891,8 +2888,6 @@ static void tcp_conn_from_sock(struct ctx *c, union epoll_ref ref,
 						conn->sock_port,
 						conn->tap_port,
 						now);
-
-		tcp_hash_insert(c, conn, AF_INET6, &sa6.sin6_addr);
 	} else {
 		struct sockaddr_in sa4;
 
@@ -2912,10 +2907,10 @@ static void tcp_conn_from_sock(struct ctx *c, union epoll_ref ref,
 						conn->sock_port,
 						conn->tap_port,
 						now);
-
-		tcp_hash_insert(c, conn, AF_INET, &sa4.sin_addr);
 	}
 
+	tcp_hash_insert(c, conn);
+
 	conn->seq_ack_from_tap = conn->seq_to_tap + 1;
 
 	conn->wnd_from_tap = WINDOW_DEFAULT;
-- 
@@ -1343,15 +1343,12 @@ static unsigned int tcp_hash(const struct ctx *c, int af, const void *addr,
  * tcp_hash_insert() - Insert connection into hash table, chain link
  * @c:		Execution context
  * @conn:	Connection pointer
- * @af:		Address family, AF_INET or AF_INET6
- * @addr:	Remote address, pointer to in_addr or in6_addr
  */
-static void tcp_hash_insert(const struct ctx *c, struct tcp_conn *conn,
-			    int af, const void *addr)
+static void tcp_hash_insert(const struct ctx *c, struct tcp_conn *conn)
 {
 	int b;
 
-	b = tcp_hash(c, af, addr, conn->tap_port, conn->sock_port);
+	b = tcp_hash(c, AF_INET6, &conn->a.a6, conn->tap_port, conn->sock_port);
 	conn->next_index = tc_hash[b] ? tc_hash[b] - tc : -1;
 	tc_hash[b] = conn;
 	conn->hash_bucket = b;
@@ -2233,7 +2230,7 @@ static void tcp_conn_from_tap(struct ctx *c, int af, const void *addr,
 	conn->seq_to_tap = tcp_seq_init(c, af, addr, th->dest, th->source, now);
 	conn->seq_ack_from_tap = conn->seq_to_tap + 1;
 
-	tcp_hash_insert(c, conn, af, addr);
+	tcp_hash_insert(c, conn);
 
 	if (!bind(s, sa, sl)) {
 		tcp_rst(c, conn);	/* Nobody is listening then */
@@ -2891,8 +2888,6 @@ static void tcp_conn_from_sock(struct ctx *c, union epoll_ref ref,
 						conn->sock_port,
 						conn->tap_port,
 						now);
-
-		tcp_hash_insert(c, conn, AF_INET6, &sa6.sin6_addr);
 	} else {
 		struct sockaddr_in sa4;
 
@@ -2912,10 +2907,10 @@ static void tcp_conn_from_sock(struct ctx *c, union epoll_ref ref,
 						conn->sock_port,
 						conn->tap_port,
 						now);
-
-		tcp_hash_insert(c, conn, AF_INET, &sa4.sin_addr);
 	}
 
+	tcp_hash_insert(c, conn);
+
 	conn->seq_ack_from_tap = conn->seq_to_tap + 1;
 
 	conn->wnd_from_tap = WINDOW_DEFAULT;
-- 
2.38.1